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Nikola Tesla was electrics engineer, and his most useful achievement was 3-phase generator... All the power in the world today is generated and distributed thanks to his invention (AC... contrary to Edison (he worked for him for a while) who was advocating DC.. ).
He was a dreamer too... and he experimented a lot with wireless transportation of electricity power, but this work went nowhere...
One of his most spectacular invention was Tesla transformer - basically a high voltage, high frequency transformer - he was able to power neon bulbs hanging in the air without wires...
The problem with wireless power distribution today would be the interference with other electronics appliances. IMHO this concept, while plausible in theory, would have been totally unworkable, because high frequency electromagnetic field woulf interfere with everything else..
We have a problem with alleged link between power lines and mobile phones and brain cancer.. imagine what would have been if the really serious power is distributed via EM field..
As far as book you are mentioning, no I haven't bought it (I even don't know what book you have in mind), but with power it is like this: what goes out, must come in from some place.. so there is no way for you to generate free energy (wind turbines or your own hydro-generators are exceptions .. but again, the energy comes from wind and/or water flow... so it is not free in principle).
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